单词 | regular tetrahedron |
例句 | As a solid, as a liquid, as a gas, and in solution, white phosphorus exists as P4 molecules with four phosphorus atoms at the corners of a regular tetrahedron, as illustrated in Figure 18.24. Chemistry 2019-02-14T00:00:00Z This is bounded by four equilateral triangles and is identical with the regular tetrahedron of geometry. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7 "Crocoite" to "Cuba" 2012-01-22T03:00:24.397Z The regular tetrahedron, with 4 triangular faces and 4 vertices; 2. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" 2011-09-19T02:00:10.473Z The soap film on the regular tetrahedron forms triangular surfaces on each side of the tetrahedron. Wordplay: Numberplay: Bubble Magic 2011-06-20T21:21:49Z That matter whose smallest particles are regular tetrahedra, said Philolaus, is fire. A Critical History of Greek Philosophy In silicon dioxide, each silicon atom links to four oxygen atoms by single bonds directed toward the corners of a regular tetrahedron, and SiO4 tetrahedra share oxygen atoms. Chemistry 2019-02-14T00:00:00Z Six kinds of primitive forms were distinguished, namely, the cube, the regular octahedron, the regular tetrahedron, a rhombohedron, an octahedron with a rhombic base, and a double six-sided pyramid. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7 "Crocoite" to "Cuba" 2012-01-22T03:00:24.397Z If six films of the same liquid meet in a point the corresponding tetrahedron is a regular tetrahedron, and each film, where it meets the others, has an angle whose cosine is −1⁄3. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 3 "Capefigue" to "Carneades" Assuming the four valencies of the carbon atom to be directed from the centre of a regular tetrahedron towards its four corners, the angle at which they meet is 109� 28′. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 "Châtelet" to "Chicago" The effect was as though one were looking down at the apex of a regular tetrahedron. Islands of Space Each atom within the crystal has covalent bonds to four neighboring atoms at the corners of a regular tetrahedron. Chemistry 2019-02-14T00:00:00Z This regular solid of four-dimensional space consists of sixteen cells, each a regular tetrahedron, thirty-two triangular faces, twenty-four edges and eight vertices. Architecture and Democracy |
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